.title {
    position: relative;
    height: 32px;
    font-size: 20px;
    font-weight: 800;
    line-height: 1.6;
    color: #1f2329;
}


.title:after {
    position: absolute;
    bottom: -8px;
    left: 0;
    content: '';
    width: 24px;
    height: 4px;
    background-color: #3370ff;
}

.collapse-box:hover .del-btn{
    display: block;
}

.del-btn{
    display: none;
}
.change-c:hover{
    color:#40a9ff
}